Colleagues, could you explain the principles of operation of the water vane vacuum pump? What range of pressure can one achieve with this type of vacuum pump? If somebody could post a reference to books, app notes, commercial datasheets of such pumps, that would be simply great.
*Correctly said by Mr.Pete. I think you are asking about water ring vacuum pump. Basically it is a liquid ring vacuum pump. *A liquid ring pump is a rotating positive displacement pump. They are typically used as a vacuum pump but can also be used as a gas compressor. The function of a liquid ring pump is similar to a rotary vane pump the difference being that the vanes are an integral part of the rotor and churn a rotating ring of liquid to form the compression chamber seal. They are an inherently low friction design, with the rotor being the only moving part. Sliding friction is limited to the shaft seals. Liquid ring pumps are typically powered by an induction motor. *Single stage vacuum pumps typically produce vacuum to 35 torr (mm Hg) or 0.047 bar, and two-stage pumps can produce vacuum to 25 torr (mmHgA), assuming air is being pumped and the ring-liquid is water at 15°C (60F) or less. Dry air and 15°C sealant water temperature is the standard performance basis which most manufacturers use for their performance curves. *You have to take negative pressure if you are talking about pressure. Negative gauge pressure, a way of expressing pressure measurements below atmospheric pressure.
I'm not telling you it all but you can take an A.C vacuum pump and it will lower the boiling point of the water where it will boil at only 65 to 75 degrees Ferlinghetti
I've worked on Rotary Vane Vacuum Pumps and Water Seal Vacuum Pumps, but I'm not sure about water vane pumps. Vacuum pumps do not achieve pressure, they produce vacuum. The most efficient vacuum pump can only get to zero mmHg. (impossible).
